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I'd like some opinions on the proper PSU to acquire. I've decided that I want to go with an inverter, only because I'd like to plug in additional devices aside from a carPC from time to time (music sampler, various battery chargers), so an extra outlet would be helpful.

What I would ideally like to get out of the carPC: music, videos, GPS, hands free phone, FM tuner, WiFi.

My donor laptop is a HP Pavilion DV1010US (Celeron M, Socket 478), sans screen, and I am planning on purchasing a Lilliput EBY701.

I considered a 400W and 700W inverter, both by Xantrex. I'm guessing that either of these would work with my setup, power-wise? The 400W is compatible with lighter receptacles, but the 700W has to be wired to the battery. I already have power running from the battery (8 AWG) for an amp I used to have. Are there pros/cons to using one method over the other? Ideally I'd like to be able to draw power without the car running but the ignition on.

Thanks for any suggestions (feel free to make other recommendations).